I tried it out, part of it anyway.
Took apart a 1.5 ohm DC, and unrolled the filler and the diapers and discarded them. Then I inserted the coil assembly back into the clear tube and glued them together. Filled with 50/50 vg/pg. Really thick.
Put on my Infinity and cranked it up. The coils boiled the liquid, it thinned out and started running out the 510 bottom hole.
Luckily I had it on a sealed shorty 510-510 connector.
I had a paper towel around the base to catch the drip.
There was vapor production, but could only run it for a few seconds before the fluid level dropped too much. Next step would be to plug the bottom hole and try it again.
Not sure if this is worth pursuing.
Cartos, with their wicking have a nice, very localized boiling effect, with the filler wicking new liquid to the hot coils at a more or less even rate.
A liquid vaporizer might work with a small boiling chamber at the bottom, with a bigger reservoir at the top.
Don't know if coils would produce enough heat to cause localized boiling if immersed in large volume of cooling liquid.
Also as the bubbles of vapor bubbled up through the cooler liquid they would tend to recondense.
Maybe trying to reinvent the wheel. Anyone have a diagram of a UFS?
Iz.